For ground-based GW detectors [1]}, [2]}, the equal-arm Michelson can be employed to detect GW because the armlength keeps unchanged.
When it comes to space-borne detectors [3]}, [4]}, the armlength is difficult to be maintained and the TDI channel is introduced to cancel the laser noise [5]}, [6]}, [7]}.
However, to facilitate the discussion for the impacts of the TDI channel A/E on SGWB detection, we will construct both the equal-arm Michelson and \(\rm A/E\)  channels in the same regular triangle detector.
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